Vercel @vercel.com · Apr 17 By controlling deployment routing in real time, new versions can be rolled out incrementally to a subset of requests—known as phased rollouts or blue/green deployments. If there is a problem, Instant Rollback can quickly revert to the previous deployment, canceling the rollout.
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Frequent deploys can cause version mismatches—when a user’s frontend is out of sync with the backend it relies on. Skew Protection prevents this by using aliasing to pin each user to the deployment that rendered their page, maintaining consistency across requests.